error establishing a database connection

…the page was set up by an old employee

You need to talk to the webhost – which appears to be VentraIP – and ask them for help, or follow https://codex.www.ads-software.com/Common_WordPress_Errors#Error_Establishing_Database_Connection

If you can’t do the work yourself, consider looking for a reputable person on https://jobs.wordpress.net/ or https://directory.codepoet.com or https://upwork.com

(FYI, it’s not a good idea to respond to work offers from random forum users who have read about your issues.)